@0x/contracts-staking: Remove getTotalBalance() function.

`@0x/contracts-staking`: Fix linter errors.

Author: dorothy-zbornak

contracts/staking/contracts/src/fees/MixinExchangeFees.sol

@@ -127,19 +127,6 @@ contract MixinExchangeFees is
         activePoolsThisEpoch[poolId] = pool;
     }
 
-    /// @dev Returns the total balance of this contract, including WETH.
-    /// @return totalBalance Total balance.
-    function getTotalBalance()
-        external
-        view
-        returns (uint256 totalBalance)
-    {
-        totalBalance = address(this).balance.safeAdd(
-            IEtherToken(_getWETHAddress()).balanceOf(address(this))
-        );
-        return totalBalance;
-    }
-
     /// @dev Get information on an active staking pool in this epoch.
     /// @param poolId Pool Id to query.
     /// @return pool ActivePool struct.

contracts/staking/contracts/test/TestDelegatorRewards.sol

@@ -83,10 +83,10 @@ contract TestDelegatorRewards is
         external
     {
         unfinalizedPoolRewardsByEpoch[currentEpoch][poolId] = UnfinalizedPoolReward({
-                operatorReward: operatorReward,
-                membersReward: membersReward,
-                membersStake: membersStake
-            });
+            operatorReward: operatorReward,
+            membersReward: membersReward,
+            membersStake: membersStake
+        });
         // Lazily initialize this pool.
         _poolById[poolId].operator = operatorAddress;
         _setOperatorShare(poolId, operatorReward, membersReward);

contracts/staking/test/actors/finalizer_actor.ts

@@ -241,7 +241,9 @@ export class FinalizerActor extends BaseActor {
                 this._stakingApiWrapper.stakingContract.getActiveStakingPoolThisEpoch.callAsync(poolId),
             ),
         );
-        const totalRewards = await this._stakingApiWrapper.stakingContract.getTotalBalance.callAsync();
+        const totalRewards = await this._stakingApiWrapper.utils.getEthAndWethBalanceOfAsync(
+            this._stakingApiWrapper.stakingContract.address,
+        );
         const totalFeesCollected = BigNumber.sum(...activePools.map(p => p.feesCollected));
         const totalWeightedStake = BigNumber.sum(...activePools.map(p => p.weightedStake));
         if (totalRewards.eq(0) || totalFeesCollected.eq(0) || totalWeightedStake.eq(0)) {

contracts/staking/test/utils/api_wrapper.ts

@@ -128,6 +128,12 @@ export class StakingApiWrapper {
             );
         },
 
+        getEthAndWethBalanceOfAsync: async (address: string): Promise<BigNumber> => {
+            const ethBalance = await this._web3Wrapper.getBalanceInWeiAsync(address);
+            const wethBalance = await this.wethContract.balanceOf.callAsync(address);
+            return BigNumber.sum(ethBalance, wethBalance);
+        },
+
         getParamsAsync: async (): Promise<StakingParams> => {
             return (_.zipObject(
                 [